There are two different types of baby bottle warmers: those that work with water and those that use infrared rays to heat baby food. Bottle warmers that work with water are usually cheaper, but have to be descaled regularly. Before buying, you should make sure that the bottles you already have in your home really fit into the warmer - there are significant differences in size between the individual models. Bottle warmers with a warming function, which keep the baby food at the same temperature for a longer period of time and therefore ready for use at all times, are particularly practical. A thawing function is also useful, with which frozen food can also be made ready for consumption quickly.